Until Numpy and Scipy are on Python 3, I'm going to reserve judgement. Python 3 might be here, now, for some things, but there are enough essential libraries out there that aren't, that it's not for most.
Almost all the Python code I've written in the past year has been in Python 3. The libraries you mention have been ported already, as have many other important ones, such as sqlalchemy, lxml, httplib2, and imminently, Django.
Very early on I had plenty of headaches where some library I needed was Python 2.X only, but that's becoming increasingly rare.
Very early on I had plenty of headaches where some library I needed was Python 2.X only, but that's becoming increasingly rare.
Edit: s/eminently/imminently/